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Topcon RL-H5A Self Leveling Horizontal Rotary Laser with Bonus EDEN Field Book, IP66 Rating Drop, Dust, Water Resistant, 800m Construction Laser, Includes LS-80L Receiver, Detector Holder, Soft Case - - Amazon.com
Topcon 555009 RL-SV2S Dual Slope Laser + LS100D Digital mm Receiver
Topcon LS-80X Long Range Laser Receiver (#1046259-01)